Fan device

ABSTRACT

A fan device includes a protective net and a fan. The protective net has a mounting plate. The fan comprises a base, a coil assembly, a blade assembly and a permanent magnet. The base is provided on the mounting plate of the protective net. The coil assembly is provided on the base. The blade assembly is provided rotatably on the base. The permanent magnet is provided in the blade assembly adjacent to the coil assembly. Via the above arrangement, since the fan is connected to the protective net with the fan being disposed on the protective net, a frame can be omitted to reduce the material cost. Further, when being mounted to a housing of an electronic device, the present invention can be assembled or disassembled very easily.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention is related to a fan device, and more particular to a fan device that can be arranged on a housing of an electronic device to facilitate the heat dissipation of the electronic device.

2. Description of Related Art

Since the housing of a common electronic device (such as a computer, a power supply or the like) is provided with circuit boards and electronic elements, the operation of the electronic elements (such as a chip, an integrated circuit or the like) on the circuit board within the housing will generate heat, thus increasing the temperature within the housing of the electronic device. If the temperature in the housing exceeds an upper limit within which each electronic element can operate normally, the electronic elements may fail and cause the breakdown of the electronic device. Thus, the housing of the electronic device is further provided with a fan for heat dissipation. In this way, when the electronic device operates, the hot air generated by the electronic elements within the housing of the electronic device will be exhausted outside the housing via a convection effect caused by the fan.

A conventional fan has a frame and a blade assembly pivotally provided in the frame. The fan is often mounted to the housing of the electronic device securely by means of screws. The outside of the fan is provided with a protective net (such as a metallic protective net), thereby increasing the safety in use.

The frame of the above fan is usually made of plastic materials and has a certain volume, which increases material costs. Further, the fan and the protective net are secured to the housing of the electronic device, and thus are inconvenient to detach therefrom.

Consequently, because of the above technical defects, the inventor keeps on carving unflaggingly through wholehearted experience and research to develop the present invention, which can effectively improve the defects described above.

SUMMARY OF THE INVENTION

The object of the present invention is to provide a fan device that can reduce the material cost. Further, when being mounted on a housing of an electronic device, the present invention can be assembled or disassembled very easily.

For achieving the object described above, the present invention provides a fan device, which includes: a protective net having a mounting plate; and a fan comprising a base, a coil assembly, a blade assembly and a permanent magnet. The base is fixed on the mounting plate of the protective net. The coil assembly is provided on the base. The blade assembly is provided rotatably on the base. The permanent magnet is provided in the blade assembly adjacent to the coil assembly.

The present invention has advantageous effects as follows. Since the fan is mounted on the protective net, a frame can be omitted, and in turn the material cost can be reduced. Further, the fan and the protective net are combined with each other to form a unit, so that they can be disassembled very easily when being mounted on the housing of the electronic device.

Thus, it is not necessary to provide a frame. Therefore, when the blade assembly rotates, the noise can be reduced while the amount of air generated can be increased. In addition, the whole appearance of the fan device is more aesthetic

In order to further understand the characteristics and technical contents of the present invention, a detailed description is made with reference to the accompanying drawings. However, it should be understood that the drawings are illustrative only but not used to limit the present invention thereto.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded perspective view showing a first embodiment of the fan device of the present invention;

FIG. 2 is an exploded perspective view showing the first embodiment of the fan device of the present invention along another viewing angle;

FIG. 3 is a perspective view showing the first embodiment of the fan device of the present invention;

FIG. 4 is an exploded perspective view showing a second embodiment of the fan device of the present invention;

FIG. 5 is a perspective view showing the second embodiment of the fan device of the present invention;

FIG. 6 is an exploded perspective view showing a third embodiment of the fan device of the present invention;

FIG. 7 is a perspective view showing the third embodiment of the fan device of the present invention;

FIG. 8 is an exploded perspective view showing a fourth embodiment of the fan device of the present invention; and

FIG. 9 is a perspective view showing the fourth embodiment of the fan device of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Please refer to FIGS. 1 to 3, which show a first embodiment of a fan device the present invention including a protective net 1 and a fan 2. The protective net 1 is a metallic protective net or a net made of other materials (such as plastic). The protective net 1 has a net body 11 constituted of a plurality of concentric circles. The center of the net body 11 is provided with a mounting plate 12. The mounting plate 12 is provided with a plurality of first fixing holes 121 that allow screws 27 to pass through so as to fix the fan 2.

The net body 11 is further provided with a plurality of fixing supports 13. The fixing supports 13 extend from the mounting plate 12 outwardly and radially to an outer edge of the net body 11. Thus, with screws (not shown) penetrating through outer ends of the fixing supports 13, the outer ends of the fixing supports 13 can be fixed on the housing of the electronic device, and in turn the protective net 1 can be fixed on the housing of the electronic device via the screws. Alternatively, the protective net 1 can be fixed on the housing of the electronic device by means of clamping.

The fan 2 comprises a base 21, a circuit board 22, a coil assembly 23, a bearing 24, a blade assembly 25 and a permanent magnet 26. The base 21 is substantially formed into a plate-like body for supporting the circuit board 22 and the coil assembly 23. A hollow bearing seat 211 protrudes upwardly from the center of the base 21. The bearing 24 is provided in the bearing seat 211.

The base 21 is provided on the mounting plate with a plurality of second fixing holes 212. The second fixing holes 212 and the first fixing holes 121 correspond to each other, so that the screws 27 can pass through the first fixing holes 121 and the second fixing holes 212. The fan 2 can be fixed on the protective net 1 by locking the screws 27. Further, a plurality of washers 213 is provided between the base 21 and the mounting plate 12. The washers 213 correspond to the first fixing holes 121 and the second fixing holes 212. Furthermore, the base 21 of the fan 2 can be clamped to or integrally formed with the mounting plate of the protective net 1.

The circuit board 22 and the coil assembly 23 are provided on the base 21 and are located outside the bearing seat 211. The coil assembly 23 is electrically connected with the circuit board 22, so that the circuit board 22 can control the operation of the coil assembly 23.

The blade assembly 25 has a hollowed hub 251. The bottom of the hub 251 is open. The periphery of the hub 251 is provided with a plurality of blades 252 that are separated from each other with a distance. The center of the interior of the hub 251 is fixed to a spindle 253. The spindle 253 penetrates into the bearing 24, so that the blade assembly 25 can be rotatably disposed on the base 21.

The permanent magnet 26 is formed into an annular body. The permanent magnet 26 is fixedly disposed in the interior of the hub 251. A casing 28 is provided between the permanent magnet 26 and the hub 251. The hub 251 covers outside the coil assembly 23, so that the permanent magnet 26 is located outside the coil assembly 23. The permanent magnet 26 is adjacent to the coil assembly 23, so that a gap is kept between the inner edge of the permanent magnet 26 and the outer edge of the coil assembly 23. Via the above arrangement, the fan device of the present invention can be obtained.

Please refer to FIGS. 4 and 5, which show a second embodiment of the fan device of the present invention. In the present embodiment, the shapes of the mounting base 12 and the fixing supports 13 of the protective net 1 are changed, and the shape of the blades 252 of the blade assembly 25 of the fan 2 is also changed. An annular portion 254 is connected between the blades 252.

Please refer to FIGS. 6 and 7, which show a third embodiment of the fan device of the present invention. In the present embodiment, the outer edge of the net body 11 of the protective net 1 extends upwardly to form a fence-like guard 14. The guard 14 has a plurality of rods 141 surrounding the fan 2, thereby protecting outside objects from contacting the fan 2 and increasing the safety in use.

Please refer to FIGS. 8 and 9, which show a fourth embodiment of the fan device of the present invention. In the present embodiment, the outer edge of the net body 11 of the protective net 1 extends upwardly to form an air-guiding device 15. The air-guiding device 15 has a plurality of air-guiding pieces 151 surrounding the fan 2, thereby preventing foreign objects from contacting the fan 2 and increasing the safety in use. In addition, the air-guiding pieces 151 have an air-guiding effect.

In the present invention, since the fan 2 is connected to the protective net 1 with the fan 2 being disposed on the protective net 1, the frame provided in the conventional fan can be omitted, and in turn the material cost can be reduced. Further, the fan 2 and the protective net 1 are combined with each other to form a unit, so that they can be disassembled very easily when being mounted on the housing of the electronic device. Specifically speaking, a user can assemble or disassemble the fan device completely simply by combining the protective net 1 with the housing of the electronic device or detaching the protective net 1 from the housing of the electronic device.

Furthermore, it is not necessary to provide a frame. Thus, when the blade assembly 25 rotates, the noise is reduced while the amount of air generated can be increased. In addition, the whole appearance of the fan device is more aesthetic

While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiment. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures. 

1. A fan device, comprising: a protective net having a mounting plate; and a fan comprising a base, a coil assembly, a blade assembly and a permanent magnet, the base being fixed on the mounting plate of the protective net, the coil assembly being provided on the base, the blade assembly being provided rotatably on the base, the permanent magnet being provided in the blade assembly adjacent to the coil assembly.
 2. The fan device according to claim 1, wherein the protective net has a plurality of fixing supports.
 3. The fan device according to claim 1, wherein the protective net has a net body, and the mounting plate is provided on the net body.
 4. The fan device according to claim 1, wherein the base of the fan is fixed on the mounting plate of the protective net by means of screws.
 5. The fan device according to claim 4, wherein the mounting plate is provided thereon with a plurality of first fixing holes, the base is provided thereon with a plurality of second fixing holes, a plurality of screws penetrate the first fixing holes and the second fixing holes.
 6. The fan device according to claim 1, wherein the base of the fan is clamped to the mounting plate of the protective net.
 7. The fan device according to claim 1, wherein the base of the fan is integrally formed with the mounting plate of the protective net.
 8. The fan device according to claim 1, wherein the base is provided with a bearing seat, the interior of the bearing seat is provided with a bearing, the blade assembly has a hub whose outer edge is provided with a plurality of blades, the interior of the hub is provided with a spindle, the spindle penetrates the bearing, the permanent magnet is provided in the hub, and the hub covers the coil assembly.
 9. The fan device according to claim 1, wherein the fan has a circuit board, the circuit board is provided on the base, and the coil assembly is electrically connected with the circuit board.
 10. The fan device according to claim 1, wherein the rim of the protective net extends to form a guard, and the guard has a plurality of rods surrounding the fan.
 11. The fan device according to claim 1, wherein an outer edge of the protective net extends to form an air-guiding device, and the air-guiding device has a plurality of air-guiding pieces surrounding the fan. 